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Heinink, Thomas P., Read, David J., Mitchell, William K., Bhalla, Ashish, Lund, Jonathan N., Phillips, Bethan E. and Williams, John P. (2017) Oesophageal Doppler guided optimization of cardiac output does not increase visceral microvascular blood flow in healthy volunteers. Clinical Physiology and Functional Imaging . ISSN 1475-097X

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Abstract

Background

Oesophageal Doppler monitoring (ODM) is used clinically to optimize cardiac output (CO) and guide fluid therapy. Despite limited experimental evidence, it is assumed that increasing CO increases visceral microvascular blood flow (MBF). We used contrast-enhanced ultrasound (CEUS) to assess whether ODM-guided optimization of CO altered MBF.

Methods

Sixteen healthy male volunteers (62 ± 3·4 years) were studied. Baseline measurements of CO were recorded via ODM. Hepatic and renal MBF was assessed via CEUS. Saline 0·9% was administered to optimize CO according to a standard protocol and repeat CEUS performed. Time–intensity curves were constructed, allowing organ perfusion calculation via time to 5% perfusion (TT5). MBF was assessed via organ perfusion rise time (RT) (5–95%).

Results

CO increased (4535 ± 241 ml/min versus 5442 ± 329 ml/min, P<0·0001) following fluid administration, whilst time to renal (22·48 ± 1·19 s versus 20·79 ± 1·31 s; P = 0·03), but not hepatic (28·13 ± 4·48 s versus 26·83 ± 1·53 s; P = 0·15) perfusion decreased. Time to renal perfusion was related to CO (renal: r = −0·43, P = 0·01). Hepatic nor renal RT altered following fluid administration (renal: 9·03 ± 0·86 versus 8·93 ± 0·85 s P = 0·86; hepatic: 27·86 ± 1·60 s versus 30·71 ± 2·19 s, P = 0·13). No relationship was observed between changes in CO and MBF in either organ (renal: r = −0·17, P = 0·54; hepatic: r = −0·07, P = 0·80).

Conclusions

ODM-optimized CO reduces time to renal perfusion but does not alter renal or hepatic MBF. A lack of relationship between microvascular visceral perfusion and CO following ODM-guided optimization may explain the absence of improved clinical outcome with ODM monitoring.

Item Type:	Article
Additional Information:	This is the peer reviewed version of the following article: Heinink, T. P., Read, D. J., Mitchell, W. K., Bhalla, A., Lund, J. N., Phillips, B. E. and Williams, J. P. (2017), Oesophageal Doppler guided optimization of cardiac output does not increase visceral microvascular blood flow in healthy volunteers. Clin Physiol Funct Imaging, which has been published in final form at http://dx.doi.org/10.1111/cpf.12401. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Keywords:	cardiac output; CEUS ; contrast-enhanced Ultrasound; healthy volunteers; oesophageal Doppler
Schools/Departments:	University of Nottingham, UK > Faculty of Medicine and Health Sciences > School of Medicine > Division of Medical Sciences and Graduate Entry Medicine
Identification Number:	https://doi.org/10.1111/cpf.12401
Depositing User:	Eprints, Support
Date Deposited:	01 Aug 2017 08:15
Last Modified:	06 Feb 2018 14:29
URI:	https://eprints.nottingham.ac.uk/id/eprint/44523

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